It's been more than a few years since I last used it, but I like the Sporty's course a lot. I've used both the Private and Instrument one with students.
One thing keep in mind that the Sporty's DVD (and I think the King also) is a combined course: a knowledge test ground school and the ground portion of a flight training course. That's not a problem. In fact, it's an advantage since you can use it to prepare for a flight lesson and review it afterwards to solidify the informational content. But to be most effective, it's best if your CFI is following a coordinated syllabus (which is available).
If you are only interested in using it to pass the knowledge test, and leaving everything else to your CFI, there are less expensive alternatives geared to just that.